Mail.app plugin compatibility for macOS Sierra (10.12)

Posted Jul 27, 2016

Mail.app in macOS 10.11 and earlier used to check the plugins compatibility using the SupportedPluginCompatibilityUUIDs key in the plugin's Info.plist. For example a Mail plugin would only be compatible with macOS 10.11.6 if its Info.plist contained the following:

Mail.app version 10.0 in macOS Sierra (10.12) now uses a different key to check the plugins compatibility. It now requires a key with the format Supported%ld.%ldPluginCompatibilityUUIDs where %ld.%ld is the operating system version like “10.12”.

If you want to make your Mail.app plugin compatible with macOS Sierra, you will need to add a key in your Info.plist like: